The company said the incident affected customers' payment card numbers, cardholder names, expiration dates and service codes from June to December 2017.

"On December 22, 2017, Jason’s Deli was notified by payment processors that credit card security personnel had informed it that a large quantity of payment card information had appeared for sale on the 'dark web,'" the corporation said in a statement last week.

Jason's Deli is working with third-party cybersecurity firms and federal law enforcement to investigate the breach.

If you believe you may have been affected by the incident, remain vigilant. Check payment card statements regularly and report suspicious activity to your bank or card provider immediately.

Contact Equifax, TransUnion or Experian to place an alert on your account, which will remain active for 90 days.

Corporate data breaches are increasing in frequency, and it's estimated they'll cost businesses a total of $8 trillion over the next five years, according to a report from market intelligence firm Juniper Research.